Cap wiring help please.

[347sixtyseven]

I have an old valve amp that had some faulty caps removed before i got it. I have gotten hold of some replacements but i am not 100% sure how they would have been connected.

Would someone mind pointing me in the right direction using the following picture.



The power and standby switches are standard 2 pin on off toggles.

Wires at A, B and C are not connected D seems to be an earth connection like on the existing cap.

Standby switch has 2 blue wires connected. The power switch has the 2 red connected.

Any assistance would be greatly appreciated.

Cheers

Gary

[lmolter]

OMG, it looks horrendous under there. In my opinion, without a schematic, guesswork + high voltage is not an option. My first impression is that someone has hacked that amp, because if you say it is old, a lot of the wiring looks new - it's shiny, not cloth covered. And the electrolytics in the photo don't look so old, either. Hmmm...

But, I'd be afraid of it without some sort of diagram. Perhaps you can create a crude schematic by carefully investigating the wiring from the power plug inward to the PT, then trace the secondaries through the diodes, choke, and whatever caps are left. That's how I would approach it. But, it's just my $.02 (USD). Good luck and keep one hand in your pocket when measuring. It's evil ;-)

Larry

[Rob Mercure]

Gary, Do you have a DMM? If you it should be easy to determine where the other end of the disconnected wires are - once you determine such report back and we can probably help you figure out where they go. But at this end of the connection it's pretty hard to look at twisted wires in a partial view of the chassis and determine where something goes unless the chassis is a familiar one - if you know the name and model that would help also.

Imolter, Lots of tube amps have plastic insulation - cloth was only common until the mid 1960s or so. You suggestion about drawing a schemo is a good one - and with experience usually only takes 1/2 hour or so (but, this isn't television - personally I can do with out the "OMG" - I live without the "evil eye" and hate it when people stereotype themselves by parroting TV phrases.)

Rob

[lmolter]

Rob, sorry if I offended. To me the ;-) is a wink and a grin, not an evil eye. It was meant as a 'be careful in there'. And as far as the OMG (Oh My God), well, I've been texting my 16-year-old daughter a bit too much. Still, maybe a little childish for such a proper forum, but nonetheless harmless. Just trying to add a little levity here.

I'm still in the dark about the 'parroting television phrases' statement.

Larry (53-going-on-17)

[Rob Mercure]

Larry, yer forgiven <grin>. Unless the rest of the nation is truly telepathic and I'm only tele-pathetic I'm pretty sure that the "Oh My God" originated on some television show. I've been out of mainstream media for most of my life (54) but I've noticed that when "everybody" is suddenly spouting a saying or making a jesture "out of the blue" it almost always originated on television - even if a particular person who's doing it didn't personally get if from television. And, for some reason I've never been able to fathom, some folks mistake television for "reality" - even to the point of believing that "reality" TV is "real."

Rob